Barrowman seeks to answer the question: why am I the way I am? In this one-hour special, Barrowman sets out to unearth what the latest scientific research can tell him about the origins of his homosexuality.
His search for evidence takes him back to his roots to meet family and old friends. He also meets with psychologists and geneticists, compares his DNA to his heterosexual brother's, and conquers his claustrophobia to undergo a brain scan - all in the quest to find out how nature and nurture might have interacted to make him who he is.
Barrowman tells the BBC: "My sexuality has never been deliberately hidden. I'm in a committed relationship with the love of my life, Scott Gill, and he is as much a part of the family as my sister's husband, Kevin, and my brother's wife, Dot. However, just because I'm comfortable with my sexuality doesn't mean that I'm not curious about it and that's one of the reasons I agreed to take this journey to discover the making of me."
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